我想在我的 ios 应用程序中实现 In-App-Purchase，我有 UPGRADE 按钮，当用户点击升级时，我使用 SKPayment SKProductsRequest 发送产品请求，并添加了它的委托方法，代码如下所示，每当我点击在升级按钮上，2-3 秒后，它给我的错误是“执行错误访问”。它仅在 sendRequest 方法中给出错误。请给我解决方案。
-(void)sendRequest
{
if ([SKPaymentQueue canMakePayments])
{
SKProductsRequest *request = [[SKProductsRequest alloc] initWithProductIdentifiers:[NSSet setWithObject:@"thisIsMyProdID"]];
request.delegate = self;
[request start];
}
}
-(void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
{
for (SKPaymentTransaction *transaction in transactions)
{
switch (transaction.transactionState)
{
case SKPaymentTransactionStatePurchasing:
NSLog(@"Processing...");
break;
case SKPaymentTransactionStatePurchased:
{
[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
//statusLabel.text = @"Done!";
UIAlertView *tmp = [[UIAlertView alloc]
initWithTitle:@"Complete"
message:@"You have unlocked Feature 2!"
delegate:self
cancelButtonTitle:nil
otherButtonTitles:@"Ok", nil];
[tmp show];
}
break;
case SKPaymentTransactionStateRestored:
{
[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
// remove wait view here
}
break;
case SKPaymentTransactionStateFailed:
{
if (transaction.error.code != SKErrorPaymentCancelled) {
NSLog(@"Error payment cancelled");
}
[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
// remove wait view here
}
break;
default:
break;
}
}
}
-(void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
{
NSArray *products = response.products;
if (products.count != 0)
{
product = products[0];
SKPayment *payment = [SKPayment paymentWithProduct:product];
[[SKPaymentQueue defaultQueue] addTransactionObserver:self];
[[SKPaymentQueue defaultQueue] addPayment:payment];
}
else
{
UIAlertView *tmp = [[UIAlertView alloc]
initWithTitle:@"Not Available"
message:@"No products to purchase"
delegate:self
cancelButtonTitle:nil
otherButtonTitles:@"Ok", nil];
[tmp show];
}
}